#include<stdio.h>
union data
{
    int a;
    char b;
};

int main()
{
    union data d;
    d.a=0x12345678;
    printf("%x\n",d.b);
    if(d.b==0x78)
        printf("litter!");
    else
        printf("big!");
        
    printf("d.b:%d\n",d.b);
};